Firestone XR-9 - Variants

Variants

Model 45B

Unbuilt single-seat helicopter with three-bladed rotor, Army designation XR-9.

Model 45C

Unbuilt single-seat helicopter with two-bladed rotor, Army designation XR-9A.

Model 45C (revised)

Tandem two-seat helicopter powered by an Avco Lycoming O-290-7 engine and two-bladed rotor, one built as the XR-9B, later re-designated the XH-9B.

Model 45D

Side-by-side two-seat helicopter for civil market, one built.

Model 50.

Four-seat version, not built.

XR-9

Army designation for the unbuilt Model 45B

XR-9A

Army designation for the unbuilt Model 45C

XR-9B

Army designation for the Model 45C (revised), later redesignated XH-9B

XH-9B

XR-9B re-designated in 1948.